FIX: use PRIsVALUE which is safer for GC
FIX: use PRIsVALUE which is safer for GC

RSTRING_PTR is somewhat risky cause GC can collect before we are ready

discourse/mini_racer,discourse/mini_racer,seanmakesgames/mini_racer,seanmakesgames/mini_racer,seanmakesgames/mini_racer,discourse/mini_racer,discourse/mini_racer,seanmakesgames/mini_racer,seanmakesgames/mini_racer